our lab is using two different columns from Enzymax.net, which work very well and price is very good as well. I like the micro spin column, you can elute DNA in just 5ul. The other column is the mini spin column and the elution volumn is 40ul. I think the design for micro spin column is different, which has no buffer retension, maybe that is why you can get 5ul elution volume.....
Yes, we had same problem before, always run out of columns and have leftover solutions for DNA and RNA kits. We have been using Enzymax RNA/DNA mini spin columns for the past 6 or 8 years and they are so cheap, $39/100 DNA columns and $59/100 RNA columns . Now, they are selling a very tiny column call micro spin column for RNA and DNA, you can isolate DNA from single colony and elute the DNA in 5ul ddH2O.
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