In Wyoming? Probably nowhere locally, sorry. According to the Espoma site, there are vendors in Texas and Oklahoma City. The big box stores are not always consistent on what they carry. You might want to check out Espoma Rose Tone, print out the spec sheet, and then go to some local garden centers to see if they have any products that are close in composition.
There is also Mills Magic Mix, but that might prove to be even more cost prihibitive for you.
Yes I got a bag at Home Depot. The garden folks make me laugh there, I do have to chuckle when they say bigger brighter blooms and respond with bigger than what a dinner plate ??? Rose tone is good stuff but yeah read and follow that label
