maybe you find this useful.
This is support for wholesale. Added 3 price levels (W/O VAT) for each product (editable in BO).
Next, you should add three customer groups and if customer is in one of these groups, after login he has his prices displayed.
Works in product detail, products list, cart and order.
Do not remember to check product categories for group acces. (Someone may have products only for end users, not for dealers.)
Further info is in readme.txt
Not recommended for beginners, as changes in db and php files are needed. Tested and works in presta 126.96.36.199
Hope this helps.
Improvements, comments, questions, etc. are welcomed