Juvies are 1-2", shipping cost depends on package weight and destination/zip code. Shipping to FL can go either Priority Mail or UPS Ground, Express Mail or overnite would cost quite a bit more. I have breather bags and polyfilter, so even 4-5 days in transit isn't a problem as long as the weather is decent.
I have a tankful of L134's, not even sure whether they're mature enough to spawn yet. My L-333's that I've had for several years now have apparently spawned once, last year, I have 2 juvies growing out now.
Brown and albino BN are about as common as convicts, more generally useful but not much easier to sell these days. The super reds aren't as widely spread around yet, so demand is still ahead of supply. They're just as easy to breed/raise as the other color variants.