Hahaha, Sounds like me! Im really the awkward nerd tomboy with the vocabulary of a sailor, don't let the makeup fool you!
I haggled a little last year. Here's how that went.
Dendrobates tinctorius "Nikita" for $50 each- Will you do 2 for $75? - Deal
2011 Cinnamon male for $125 (I think) exactly what I wanted- Will you do $100?- Deal
I think most vendors expect it and probably enjoy someone who can haggle. I think that they leave a little room in their price to haggle and as long as you are polite, they will work with you. Maybe ask first, "Are you willing to lower the price?" If they agree and you make an offer and they say "No" that doesn't mean "No, I hate you, you should hate yourself forever, how about you go in the corner and cry"
(Maybe thats just me that thought that?)
Just make another offer and shrug it off. I think vendors also like to make combo deals with multiple items or snakes. I think it lets them know you are more serious.
I say all this like I am going to be calm and collected. You will see me crying in the corner because I think a vendor hates me because they rejected my offer! Haha!