Did you get the PM I sent suggesting two possibilities? The best seems to be the WWBW scheme (Woodwind and Brasswind). It may also be an option to pick one up on eBay that fits what you are looking for - I note that there was a V16 5M Alto mouthpiece for about $70. The other alternative is to contact a mouthpiece maker (like Phil, of PhilTone fame, and describe what you are looking for. I would suggest that it is useful to have at least 3 mouthpieces, so that you can gradually see which one emerges as the right sound for you, and a trial may be too short to achieve this. On both Alto and Tenor I have owned and played several mouthpieces before being able to see which one I prefer.
So, as someone who has had to buy first, and then try after, it has worked out OK. Final thought - see what JunkDude has in stock.