At the top of this page, click on the link that says "member store." It will take you to Powernutrition but you'll see better prices.
The T-1 Pro is an 8 oz bottle whereas the T-1 Final is a 4 oz bottle. Comparing the two at 8 oz you'll see that they both have 5 g of 4-AD, but the difference comes with the amount of 1-Test. T-1 Pro has 10g whereas T-1 Final has 5 g. Primarily due to 1-Test lethargy, Chemo dropped T-1 Pro and T-1 original and came out with T-1 Final. Due to popular demand, he reintroduced T-1 Pro.
The standard dose for both T-1 Final and T-1 Pro is the same, 1 squirt twice per day (some have tried higher doses).
Run a search on here and you'll see lots of user feedback on both. Bear in mind, that the two being sold now are using the new transdermal formula which is more efficient than the old formula and seems to be easier on the skin.
~Todd
P.S. BDC has an arrangement with legalgear.com, and they have a competitive product to T-1 Pro and T-1 Final.