BSS B2B Wholesale Solution

This will solve all of your issues of providing separate pricing for wholesale customers. Not only can you separate wholesale and retail, you can restrict access between the two, have different tier pricing, sign up form for wholesale customers, etc. They have endless features to solve the restriction between the two distinctions.
Also, when you are stuck or can't get something to work the way you need it to, their support is incredible! Their support turnaround time to specific issues alone is worth the price. Can not recommend more.