I've done that so many times myself, but now I mostly reconsider whether I want to take the time to trek back there later to get the other(s), and I decide -- hey, I'm worth it -- I should have it all NOW!
Life is much easier with my new philosophy -- although planting/potting and dealing with everything I keep bringing in is another problem. I suddenly realized yesterday that I'm rapidly filling up all my tables with daylilies I want to use for hybridizing and my little daylily seedlings -- and here I'm already ordering irises that I'll have to pot up and put up another 8' table to carry them over the summer until I can get them in the ground in Sept/Oct/Nov -- it's always something... I'm great on new ideas but not so great on follow-through, unfortunately.
But that never stops me from ordering -- absolutely no self-discipline here! I am cutting back on new irises, though. Two years ago I ordered something like 150 new irises that I had to make spots for, but by this year I'm up (down?) to 37 so far! But I also order 2nd rhizomes to add to the clumps of those I really like, and I'm up to 50 on those. But compared to a couple of years ago I've reduced by more than half.
Well, I'm off to a morning of grocery shopping now -- yuck!
