The prices you're paying are in line with what I pay locally. Ordering from an overseas vendor may appear to cheaper up front but it they don't provide you with a quote for shipping or if you do not know what the duty fees are it could mean it is about the same or more. Not to mention many products are no longer accepted for shipment by postal modes. Shipping enamels and lacquers is tough and if they do have to ship via a frieght carrier...ex pen sive!
Supporting a local retailer keeps the economy in your community strong. There are however, time when shopping outside via the internet or catalog is necessary on several levels. Just remember that the time will come when you need something NOW and when you run down to that LHS, their doors are closed because no one elected to support them.
Paint prices seem to be going up for numerous reasons. I too find at times my production costs fluctauting on an almost daily level. However, by smart purchasing of raw materials at the right time, and allowing for these changes one can maintain a fixed price. But, now with the increases in shipping costs and the decline in the dollar, that adds yet another issue to the scheme. I'll hold the line as long as I can!
My suggestion is that you do do a little compariative shopping, but understand it many cases the prices will wash out the same after everything is said and done.