I usually mail order such things from Adorama or Focus. There really aren't any good photo shops in Dallas anymore. All my astronomy oculars are mail ordered and filters are usually cheap except for solar or hydrogen alpha.
The sad thing is, I have film cameras ranging from a Mamiya Super Press 23 (2.25x3.25), RB's, Canon F's and A's, two darkroom setups, all pretty much worthless now days. Digital backs can be had for those old cameras but they cost as much as a new SLR. All the lens sizes are different.
My daughter gets instant gratification...and some amazingly good shots...with her 8mp point and shoot digital, which took the wind right out of my photography sails. frown I bring her if I want first rate photos, now. grin
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paul, texas KD5IVP