If you can find it, finasteride powder is the way to go
$20-$50/gram ( that's 1,000 regular propecia pills for the mathmatically challenged) is a steal
Suspend it in a glass jar with a 1ml eye dropper in some everclear and mint oil, and you've got several years worth for cheap.
You can find the vials at any chem store and the everclear is too easy, finding the powder is the difficult oart.
You can also buy this premixed at
www.ag-guys.com or several of the sites that sponsor this board
usually at 3-5mg / ml dosage, so 3-5 months worth is around $40-$50 , super cheap compared to the $60/month for the real thing