check out www.patsreloading.com
for surplus tracer pulled bullets. Might be a better deal. I bought a whole ammo can of 224 ones at Perry one year and it was a decent deal.
I won't shoot them in my good barrels, choose to shoot them in a stock AR barrel. Can't say if they'd harm the barrel or not though. I suspect that with cleaning afterwards it should be fine. The ones I have won't light till they are some ways out of the barrel so I don't think heat is or would be an issue.
FWIW the stock barrel I shoot them in, well right before deer season I rezero'd it with 69 gr HP ammo and it shot a 3/4 inch group at 100 much to my surprise. So that barrel has no harm and was NOT cleaned after any tracer shooting. Though I tend to always shoot some different ammo after the tracers (me thinks it might help blow any crud out tahts not needed or wanted after the tracers)