Groupon was started as a wordpress blog and while you can always follow the groupon model (i.e. test the market with a simple system), there are scripts available to build your own Groupon site, i.e. daily deal site.
Groupon Clone Using WordPress Plugin
The plugin has all the needed functionalities like Deal Creation/Stats/Payment Gateway integration/SEO etc. and pricing starts from $199.
The plugin lets you create deals, launch multiple locations and assign categories/tags to your deal offerings.
What’s really interesting is that you can take the advantage of WordPress’ rich functionality/ existing plugins and make it a much more richer product.
A stand alone product, Wroupon has all that it takes to create a Groupon clone.
Wroupon offers several features like different account views (user view, partner view, admin view), secure remote login, paypal integration, Twitter/Facebook connect etc and costs only $89.
Wroupon or GBS? Well, first get started with selling to brands, get their deals and use either one of the system.
Wroupon seems more scalable than GBS – though the challenge with both is that they only support Paypal [countries like India have banned the local transfer to paypal accounts].
There are other scripts available like Groupscripts, which costs a bomb (in comparison) – $399, as opposed to $89 (Wroupon).