At 36c for a 11x17 I think SirCooper are losing money - it must be a 'loss leader'.

Find yourself a good, local giclee printer. They'll be used to dealing with artists and photographers (who can be very demanding) and offer reasonable prices; just don't take that 36c deal as any kind of yardstick, and be prepared to pay a little over the odds for much better quality.

Also, unless you have a properly calibrated monitor and some idea of how to prepare images in a color-managed workflow, don't expect the printed results to be an exact match for what you saw on screen, or what came out of your crappy desktop printer.

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Windows 10 x64 Pro - Intel Xeon E5450 @ 3.00GHz (x2)

PoserPro 11 - Units: Metres

Adobe CC 2017