$25 is absolutely nothing when people are looking for the best. Help them figure out why they're considering you in the first place: better reputation, better appearance, better quality, etc. You can close the deal if you really believe that you're worth that extra $25. Just believe it and help...
There's nothing wrong with what you said, except that it was very passive. You let the customer slip away with very little intention to close the customer on what he was very interested in initially. Email him back and give him the information he requested. Offer again to come out to him to see...
There's some real bad, sissy advice here. Get your money. Put your business owner pants on, call them up and ask for payment and go and collect your payment. Any time you waste will add to the fear of you ever even calling them back, then you'll be out money for a detail and you'll be more...