Join Date: May 2004
Location: Vancouver Island
Or pick up used speakers at thrift stores. Look for made in (USA/Canada/UK/EU) if you don't recognize brands. Beware of "white van" junk, and rotten surrounds. Although if you want to DIY, speakers with rotten surrounds can be worth buying for the cabinet and tweeters and crossover parts.
Buy a T-amp module on eBay; search for TA2020 or TA2024. Not floor-shaking loud, but good for an office/bedroom system.
If you want loud, steer clear of the "Technical Pro" stuff unless you are a meth cook; Pyle likewise. Look for used (semi)pro stuff like Behringer, Peavey, etc at music stores and pawn shops. You can't build stuff as cheaply. Used (semi)pro speakers are iffy; they've been used and abused and possibly repaired with cheap substitutes. I'm inclined to suggest buying cast-frame 12" to 15" drivers from Eminence or Selenium (with sensitivity approaching 100 dB), and a horn-loaded mid/tweeter, preferably round which is supposed to reduce horn coloration. A prebuilt Eminence crossover may work. This may not be very cheap, but will be seriously loud and handle plenty of power.