I looking for an affordable aluminum radiator for my 95 Lexus SC 300. I'm not too experienced working on the car so something that would require little or no modification would be perfect.

Rockauto.com has several options that will be less expensive than your local parts house.

Edit: Didn't read the op post closely. I assume you mean all aluminum, no plastic tanks. I bought a 3 row Mishimoto from somebody for less than $300. It is fit for a Supra, so it doesn't fit exactly, but some minor changes to the top clamps it will fit ok, not great just ok.

you'll need a tranny cooler if auto, which is easy to do, but I got mine off eBay, decent quality for like 150