if they are 100 watts. then you dont need much more than a 30 watt amp. ass for low cost...you should try look in ebay and look for a reciever or integrated in this range. shouldnt cost too much. ive never dealt with ebay. so i cant tell you what to expect in that regards. if possible try stay away from anything that doesnt weigh much. unless you can get a class d amp. if you know what to look for in stereo equipment you can even find some in thrift shops. but it is not recommended for just any one, as most of the stuff that goes thru them are junk. very rarely does a gem of a piece go thru. look in craigslist as well. im sure other members can lead you in better directions than i could.