TV forum vs movie forum? Too hard a choice. I'll go with Gen Disc.
For a limited time (though 11/9/03, I think), Costco has the 4-disc Looney Toons Golden Collection for $39.99 (a full three dollars less than the next cheapest place). They have Space Jam for $17.79; not bad, but not quite as low as Target.
But here's the awesome part: if you buy both at the same time, you get $20 off! So basically, it boils down to you buy the set of classic 'toons for the cheapest price, and they essentially pay you $2.21 to get Space Jam!
Pretty in-freakin'-credible deal, if you ask me. It got me off the fence as to whether to get Space Jam or not.