6% MetaPhor (FMC) agarose (1X TBE, 0.5% EtBr) with a large preparative
comb, followed by electroelution, desalting and concentration with
centricon. Easier than acrylamide sequencing gel followed by crush and
soak. MAYBE a little faster.
P.S. Add the MetaPhor to RT 1X TBE, stir in, then heat slowly to boiling
and clearing, since it boils over too easily in microwave.
I have used this successfully for 20-50-mers.