Springfield, Springdale, same difference, eh? (This is why I need Google Maps prior to going anywhere!
But yeah, I've had good luck with both. Sparkling had a good deal on upgrading my 5# to a 10# for $20 or something like that total, so I stopped by there. I go by Valley National everyday downtown which is nice but not sure about leaving a CO2 cylinder in a hot trunk even if empty. Never had a CO2 cylinder shoot through the side of the car, but the excursion to Tylersville is kind of nice...driving through the middle of no where.