Start it at $49.99 on a straight-up auction with no reserve.
Having sold my share of Hawks duds on eBay, I've found that establishing some value up front gets folks thinking a bit. Don't do the "buy it now", takes all the potential out of it. If it goes a week without any interest, don't be too hasty dropping the price. Part of the fun of selling an item is the drama. Never know, some dude may need that jersey to complete a set...?
I wish eBay wouldn't have done the store concept and just kept it a straight auction site, but hey, corporate money guys...
"...Seattle has become the capital city of the New NFL" - Kip Earlywine