so could i use a brushless esc with a brushed motor? cuz i got older brushed motors and my esc is made for brushless... could i still use em together? or will it kill my esc or brushed motor?

some can, some can't. what esc is it?

well... idk, my friend was gunna buy a new esc, and all he can find are brushless esc's. any brand si should buy that arent a big hit in the wallet? cuz i know he wont need speed, and he will never go lower wind then 15.

well, my recommendation for quality/cost best deal would be hobbywing stuff, which you can get on hobbypartz.com .
I thought your question though, was whether the esc that you own could run brushless motors. like I said, some can, but many cant. If your "friend" is going to buy a new esc, he/she should consider just running brushless motors too, since they're easier on batteries. If he really just needs a brushed esc, I've got a tekin rebel 2 for sale he can buy for $25.

Most of our earliest BL escs were brush/brushless to allow customers to transition from the old technology to the new. But now, we are designing brushless only controllers. (Except for Brush Crawler escs.)

Of our current escs, GTBs, SLYDRs, Mongooses, Havocs (1S, 2S, 3S) are brush/brushless. Some of these are available in our RMF store (link in signature). We have BL motors, too, if you want to convert to all brushless