Not surprisingly, DFW prices are similar to Houston's.  The jeweler restringing price seems to average $3.50-$5 per inch.  Beading is very popular here and I wouldn't be surprised if some of the independent bead shop employees/owners who are handy with a knotting tool are willing to undercut jewelers.
Question for those familiar with bead shops in other parts of the country-- is Swarovski popular everywhere?  I've been hunting around for silk sources and it seems stock tends to be 60% Swarovski crystals/pearls, about 30% natural semiprecious, with a few strands of dreadful* dyed freshwaters included in the remaining 10%.  
I'm asking on this thread because I frequently see semiprecious rounds knotted up like pearls, which would mean the skill of knotting is more common than I'd assumed.  
*I'm not being snarky-- zero luster, dye caked in the dings, very small with blobby shape.