Quantity of invites to order

I am Going to order my invites today or tomorrow...decided not to wait any longer!

I need send 122 invitations would I be safe ordering 150? Or sould I send the extra $ and get the extra 25?

I really need help on this I don't know...PS I will probably be printing my own envelopes. I did it for my engagement party and they were very nice.

Its better to have a little extra, because if you ended up needing more it will actually cost you more to put a whole 'new' order through.

My invite list was 151 (and you can only order in increments of 25). So I ended up ordering and extral 25 more, which equaled to 175 invitations in total and plus I ordered 25 extra outer envelopes, just in case I messed up.