Chris at Top Shelf has an excellent reputation Andre. I've haven't had the opportunity to purchase from him yet but he was the first person I met online when I first got into ball pythons and he was very helpful to me.
It's probably just a busy time for them right now but I'm sure they will get back to you. Sometimes a bit of patience is called for. These folks get a ton of email every day (I'm sure Kara and Adam can attest to that) and wading through it on top of all their other daily husbandry duties as well as running a business and finding family time......well it must be just crazy some days.
A day or two or heck three or four isn't very much time to wait for a response in my opinion. Personally I'd rather someone I want to buy from takes a few days to get back to me with a good email answer than dashes off something quickly just to get me outta their in-box LOL.
~~Jo~~