^^^ I *love* Meyer lemons too, BlueWillow! I think they are one of my favorite plants ever - beautiful fruit and flowers, in and out of bloom nearly all year and a tough citrus plant - you can't ask for much more

!
Sum, I have bought my citrus in 3 places:
1) Flying Dragon Citrus Nursery in Mandarin: You'll pay more here (about $30 for a small citrus tree), but you'll get quality. Many of their citrus trees are grafted onto Flying Dragon rootstock, hence their name. Flying Dragon rootstock makes a dwarf tree that is very cold-hardy so the extra $ can be worth it if you need that kind of tree.
Flying Dragon Citrus Nursery
2) Beach Blvd Flea Market: $15 per tree, any type. These trees are just as good as you'll get at Lowe's/HD, they are no different (probably the very same supplier). They have the inspection tags and everything, in case anyone is wondering.
Beach Boulevard Flea Market
3) Lowe's: I've only bought one tree here, an impulse purchase. I forget how much it was, $15 or $20?
I'm a newbie to citrus too, but so far, so good

. These are the citrus trees I have right now:
Meyer Lemon
Limequat
Variegated Pink Lemon
Persian Lime
Calomondin
I had a Kumquat tree too, courtesy of our very own "Karla with a K", but it died

.
I'm obsessed with the idea of getting a Moro Blood Orange tree and a Kaffir Lime tree right now...I need to track them down!
For anyone else new to citrus, I found the following 2 books very helpful:
Month-By-Month Gardening in Florida by Tom MacCubbin
This book covers more than citrus, but the citrus section is wonderful. Tom MacCubbin writes in a very accessible way, I recommend anything he's written.
Ortho All About Citrus & Subtropical Fruits
I borrowed this one from the library, but I'm going to purchase it soon. Great book, more citrus info that you'll probably ever need and color pictures on every page.