Nutshell,
You didn't say where you are in Western MA, or what caliber but just about any decent gunshop should be willing to add your order to their weekly order.
With the recent ammo shortages, the question will be whether they can get what you need.
You might also get a better deal if you offer to pay in advance.
I deal with Nicks Sport Shop in Palmer and have never had any problems special ordering ammo or components.
IIRC, there is a gunshow coming to the BigE next week. You might want to arrive early on Saturday and check out the ammo tent.