Custom Google Maps API for website

Please only quote this if you are serious and plan to complete the project as needed. I need a custom Google Map built into a website I'm currently building in Dreamweaver 8. I want something similar to what's found here: [login to view URL] I've attached a document to show details of what I'd like (using the map in the link above as an example). Basically, I'm starting a web-based gift certificate company and I want people to be able to search by location and return a number of gift certificates to local businesses in their area. They would then have the ability to link to add the item to a shopping cart or they can link to another page on my site where they fill in info to bid on it (name their highest price). I plan to use Paypal for the shopping cart; I'd just need the map feature from you. Also, I'd like to have a geocoding feature embedded, so I wouldn't need to enter lat/long. However, let me know if this may slow down loading the results with about 50 data points. If so, I'll go with entering lat/long per business so the response can be faster. I'd also need a php file developed to link the information. Details on the php file are in the attached example. Please let me know if you need any other details for putting together a quote. Thank you.