It always surprises me when I talk with people about ammo. It seems that most people are content to buy their rounds in the 20 rd boxes that most stores and manufacturers continue to push on the public. Pistol ammo used to come in 50rd boxes and anything less was a mere exception. Now it seems that only law enforcement and military get larger quantities.
Being a retired LEO, I have been used to dealing with LE suppliers and I know that many will deal with the public and often shipping charges are very reasonable. In a lot of cases the cost of 50 rd boxes of premium ammo is close to what many are paying for 20rd boxes at their local store. While I am a believer in supporting local businesses where I can, I am not a believer in wasting my money. In most cases one will get the best price by buying in half case lots of 500 or more rounds at a time. If the Rohrbaugh is your only handgun that may be too much, depending on how much you shoot but if you own other weapons in the caliber then it's just the ticket. Keep in mind that Federal, Remington, Speer and Winchester have their suppliers grouped as LE or Commercial and many shops that are regular commercial can't even buy the 50 rd box LE variety ammo. However be careful when ordering because a lot of LE ammo, especially in Federal comes standard, +P and +P+, so get the right stuff. Because Rohrbaugh specifically says not to shoot anything hotter than standard. Four LE suppliers I have bought from and continue to patronize are...
SGAammo.com in Oklahoma and and exceptionally large
selection of various brands, especially Federal
and Speer. Speed of delivery and email
is second to no one.
Ammo to Go in Texas and while their selection is not quite
as good in some things as SGA, their price is
often as good and they have some odd things
that a lot of LE suppliers don't carry like full
power Federal shotgun ammo which I like as
opposed to the low recoil stuff that many
departments are ordering. Very fast shipping
and they are reliable.
Streichers A little more expensive and currently pretty
heavy into backorders or high power stuff but
for non +P like a Rohrbaugh requires may have
it in stock and practice is almost always in
stock. They have an annoying habit of adding
the hazmat fee per box in checkout.
Cheaper Than Dirt They get ammo in 50 rd boxes on
occasion and often are the only place where
one can find the Remington Brass jacket
bonded Golden Sabre. And I like that round
the best in my 40 calibers.
There is absolutely no reason to settle for 20rd boxes at high prices unless time is critical and you need it "right now." Also keep in mind that most "short barrel" ammo sold by Speer doesn't come in LE selections except 38 Spec. It may be available somewhere but I haven't found it. I did find .38 Spec once and bought a lot of it. Almost all "short barrel" ammo is +P however, including the 9mm so it wouldn't probably be wise to consider it for a Rohrbaugh. In S&W 5 shot revolvers I've thought "short barrel" the most accurate round I've ever seen.