www.partsexpress.com has a nice and cheap crimper for coax, its the one with the green handle. I am not sure what snap and seal is, if your talking about a compression connection then keep looking.
Sized for RG59/U and RG6/U 75-Ω coax cables, a line of RCA crimp connectors allows consumers and manufacturers of audio equipment to build their own cable assemblies or alter cables that they already ...