i was at a garage sale the otherday and a guy has a 240 gallon acrylic tank complete with5 lights heaters lots decrotive rock.The sump is broke and there is no stand.I have never had an acrylic tank but heard they scratch very easily.My questions are can acrylic be to scratched to fix and what should i build the stand out of.and finally how much would a sump cost???? p.s. he only wants $500.00 thanks everyone for you help!!!!

Where is this tank at?

Yes acrylic scratch easier than glass but acrylic is easier to buff out that glass.
With some elbow grease and proper grit of especial sand paper you'll be able to restore this tank to a clear viewable tank. I made a stand for 240g acrylic using 1x4s and 3/4" plywood. If you are Leary about 1x4s you can use the more stronger 2x4s but that stand is gonna weigh a ton

I am assuming that this is a drilled tank with internal overflow, I suggest you buy a wet/dry sump rated for the overflow.

TO MUCH MONEY !!! Ive had acrylic and it had some scratches not alot used 2000 grit sand paper and the best acrylic polish and u can still see the scratches!! i even used a buffer to polish them out..But still u can see them alittle..but then again im picky.U can have them buffed with resin at a shop and it will be like knew but after u buy that tank and have it buffed u can buy a new 1 at that cost and maybe a stand!!And when u clean ur tank be carful cause dont scratch it!! U will have to empty it to remove new scratches.and a tank that size well thats alot of work. But thats my expirence!!