I purchased this domain in 1999 (15 years ago) for my home business, but am now selling develo.com for the following price as of September 6th, 2015:

$64,007.92 USD

Previous Prices

August 23rd, 2015 $64,345.44 USD

In case you are wondering how I came to this valuation, it is the outstanding balance on my home mortgage. The price will continue to drop as I pay it off. Please refer to this domain's whois information for contact info if you are interested in buying it.