Is it because you are in Ca. and all the screwing is smaller diameter ?
Try finding an 8-48 die or tap. Bet even the Snap on guy will not have that.
small tap and dies are always a PITA, to find... sucks even more when you break one... its always on the last or next to last hole... always.
The odd ball stuff is when it gets crazy to find. The treads used for suppressors for example. they are often not a fractional size and rarely a whole number pitch. its often .XXX" -XX.5.
Then there are the english... you will never find a vintage english car owner with out a set of whitworth tap and dies and a complete wire kit. lol
now when it comes to threading pipe... lets just say, if its from 1/4 to 6" I have the tools needed to do it. 4 manuel threaders( all ridgid 31a, 36. 141 and 161) and 1 powered in the ridgid 300. The 141 and 161 are gear reduction ratching type, they They are about 150 lbs each, but when you have to thread 2 1/4- 6" black iron pipe and you really don't have a choice.
Trust me you don't even want to know how much a powered pipe threader costs when you get over 2" a ridgid 300 will get you to 2" @ ~ $3500 a 1224 with get you to 4" ~ $7500 anything bigger then that and your looking at about $40000.( which is why I bought the 161 @$3700. Used it on 2 jobs, both of them asian restaurants.)
Just to give you a idea on how much gas we are talking about here. Look at this table...
http://www.engineeringtoolbox.com/natural-gas-pipe-sizing-d_826.htmlThose figures are in thousand of BTUs. One job needed a 4" main line the other 6" main line and both were less then 60' in total lenght. The average all gas 2k sqft house, might have a 1" main line( normally its 3/4, won't be any smaller), using maybe 240k BTUs max. Next time you go into a Large asian restaurant, don't bitch at the price of food, There gas bills can be crazy...