Just make sure your 16mm pots from Tayda come with the washers a nuts. That's the *only* gripe I've ever had about Tayda.
Right now, I go to Tayda for Pots, Trimmers, Resistors, Caps, Diodes, and ICs. Great selection, and I can get the 5% carbon film resistors for about $0.01 each. Not everyone's cup of tea but a great way to get sorted and labeled resistors to fill out your stock. They also have decent tantalum cap prices. I buy hordes of stuff there. It's cheap enough that when I need a particular non-bulk-type component, I usually go ahead and order 4 or 5 more for future projects that might need them and/or replacement in the case of a bad IC or one blew up. It's too cheap not to.
Also, the last two orders I've placed with them I've received within just a few days. I always use the "Economic Express" shipping option for just a couple of dollars more, and it really seems to be worth it.
I use mammothelectronics.com for enclosures. I really haven't found them cheaper. Not the cheapest, but aside from a small period where their popularity outgrew their ability to process orders, they have been really nice and dependable to deal with. The powder coated and drilled enclosures can get a pricey, but I really only get those if I'm making a pedal for someone and can recoup the cost. I personally always order blemished enclosures. 5 1590As for $15, 5 1590Bs for $20, etc. I've only once gotten a batch that actually looked a bit blemished to me. My last order (shown in my "New Enclosure Day!" post are actually all ordered as "blemished" but not one of them had a visible imperfection that I could find. That made screwing up my first 2 1590A enclosures easier to deal with.
They're also pretty good for ICs and such, but where they really hit it out of the ballpark is with their 3pdt stomp switches. For $2.25 each it's hard to pass up. I know most of you aren't in the US, so not sure how the shipping would work out, but it's acceptable here, if not exactly cheap.
It's weird, a lot of their stuff is laughably overpriced ($0.20 per resistor!?!?! $0.50 for a cap?!?!?) but other stuff is cheaper than I find anywhere else.
Smallbear is a good place. Not cheap, but they do have some unusual stuff that is worth paying a bit more for (the low profile 1/4" jacks for the 1590A enclosures AND decently priced 9mm pots). They're not my first stop, but I do hit them up fairly regularly for goodies that I don't immediately find elsewhere. The guy who runs it is a really nice dude, too.
Guitarpcb.com
Not a huge selection of parts, but what they do have is decently priced to the point where every time I buy a PCB, I have to grab a bunch of other goodies as well. Barry is a really cool decent guy who likes to stuff tons of extras in every order. Not insignificant stuff either. Among the cool assortment of freebies is a Mini Klon PCB, and Zendrive PCB, a SHO Nuff PCB, 3pdt pcbs for easy wiring, guitar picks (surprisingly high quality, I keep these in my "regular" use pile), etc.
He has the BEST wire I've ever used, called "Barry's Best Hookup Wire."
He has the cheapest prices I've found on "Pot Condoms"
Precut 3 header transistor sockets
5 packs of some common Opamps for really great prices
Hand matched transistors 2 and 4s
Germanium transistors (and sets) Measured and labeled. They're not exactly cheap, but you know you're not getting junk either.
Oh, and is DPDT mod wiring boards are COOL! Seriously, I think some of you here might get a head explosion from these things.
When I need stuff, I actually hit there first and get a few common things I need, and then start shopping for the more esoteric stuff.
Locked
there is a thread in Open Chat that has a lot of good suggestions for where to buy and where to avoid so I'd suggest having a good look there and see what works best for yourself. Very few places are good for everything though so you might find yourself favouring a few different places depending on what you need at any particular time.