i will tell you what worked for me for 15 years or so. you will need to figure out what works for you.
there is a guy on faunaclassifieds in the cages and and supply section that sells some nice acrylic displays. i got mine many moons ago at the dayton expo ...no clue who the vendor was
i used deli cups, over time i found that customers could get more hands on and were more likely to purchase. it also helped me gauge the customers interest when they picked up a deli cup i knew they werent just browsing and it gave me and idea of what they may be looking to purchase.
now the potential problem with that is theft. that is why acrylics are nice, especially for high end stuff. imho a blend of the 2 is nice and acrylics will sort of highlight the nicer stuff
i would pack up the critters into deli cups the night before and put them in a large tote and in the morning put them in the car for the hour and 15 minute drive. keep the car as close to a reasonable temp as possible
i did some selling online but 90% of my business was done at shows. i sold alot of affordable items so how could you justify $50 in shipping on a $50 gecko
yes electricity and a table . the rest is up to you ....lights, banner, table cloth are all a part of your presentation. some vend bare bones and some go all out just make sure it looks nice
good luck Kirk