ASP Website with MSSQL

We are looking at long term association. So the winner shall be selected on pricing & merits only. The budget is approx $500 We wish to get a website developed through which we wish to seek wholesale buyers & retail customers for our range of products. The process shall be as under: Surfer visits the sight. He/she is able to sign in as a whole-seller or a retail customer. Wholesale sign-ins are first approved by our company after verifications and then only the person enters the wholesale section later (A note is displayed to him/her about the process & an e-mail is sent to his e-mail ID). At the end of the sign-up he/she is asked to punch is the security alphanumeric code (embedded in image format to avoid automated sign-ups). Retail customer simply is taken to the catalog home page with [login to view URL] the retail customer can simply buy our products and get these shipped to the desired destination. Whole sellers from India see Indian specific pricing, terms and other details while people from outside India are informed of added riders applicable to their purchases (like extra handling & packaging charges , custom duties terms, levies, Taxes etc.) Whole sellers are shown image of product (Thumbnails of images of available colours & designs in a set shall also be displayed along and the main image is replaced with the image in the thumbnail on 'mouse over' or may be a slide show can take effect with a preset time)with wholesale price and details of product on one side and live/pre-recorded video of the model shoot of the same product on the other side. The product code, quantity, colours available, no. of units per set, sizes available and other relevant details are shown along with the product. View of all whole sellers logged-in is available to us. Logged in whole sellers can book the items being shown with live information of depleting quantities etc. and have a record of their bookings in their personal "My Account" page. This shall require continuous & daily updating of products from us with respective videos. For this we shall need an application. This is all info as of now.....Please.