Red comet adx used to be my spot, but they moved up to north glen
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Yep, they are up here in Northglenn off 104th and Irma. its 9.00 I think for a 5lb fill, they fill while you wait. I use them as they are less than a mile from my house. They have strict hours though, Monday-Friday, 8-4:30 and will fill tanks up to 4:00
It seems that most of the hydroponics place so Lu do 20# tanks. They have really cheap swap out programs. I have no idea it I would check there first if you have ability of keeping a 20# with your setup.
Check out the locations at the bottom of the page.
u can find cheaper than 10 for a 20lb swap. way to grow is like 7/8 bucks. they know if they over charge for c02 there $ flow will go somewhere else, nature of the beast in that area, its more to get people into the store where they make it back on other markups.
theres also a place near/across the street from boyers coffie that does refils
would be nice if the mods made a sticky of co2 spots i remember i made a good list while back for people.