won a F90T17 ballast on ebay for $33.48, there was also a magnetic slimline ballast in the photo so maybe that comes with it? it was not clear in the description which only listed the F90T17

ballast

http://www.ebay.com/itm/290780036506?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

I saw that one and did not understand their photography either.  I hope they send you the described ballast! 

Yeah won't be too happy if all i get is that slimline ballast cause that's a little pricely for one, i believe both are included, maybe ill ask the seller