I am 6'6" and know exactly how many big track frames or complete bikes come up on Ebay. Generally when I do see one I watch it at least. I have bid on many and even won some. One I bid and won the auction, but never got the bike (a Marinoni). Ebay was useless in helping too.

I would say be patient. Before I even had a track bike I never thought I would ever find one in my size much less at a price I could afford. Then one day a guy drives up to me and offers me two Schwinn Paramounts in my size (P13 road and a P14 track). I bought both and a bunch of parts for far less than they are worth. Then I found another on Ebay that was local and made an offer he couldn't refuse. Then added another (non-vintage) track frame/fork I built up, and then added another off of Ebay. My current track bike total is 4. The nice thing about being this size is they tend to go for much less than a smaller size would. One of my non-vintage track bikes is a GT GTB I bought for a little over $500 complete with shipping. I have watched smaller GTB frames/forks go for more than that.

Patience, tall track wanting grasshoppa'