Harlan Tekklad is indeed a great all in one staple food choice for rats. Others also swear by Mazuri. Both are fine.
Harlan Tekklad company doesn't sell to individuals. They mostly sell to laboratories in bulk as Vlad said. I think different rescues get it in bulk from the labs usually. In addition to the Crafty Rat, Mainly Rat Rescue is another source for harlan tekklad.
Also, the cheapest way to get Harlan I've found is to go through Amazon. HT is sold in 40 lb, 18% protein bags under the commercial name Native Earth.
While there are many grass roots rat community diets you can try, I've found HT supplemented by veggies and fruit to be the cheapest and easiest healthy diet to maintain.
Phoenix Gate Rattery has a nicely detailed, easy to follow nutrition page: http://www.pxrats.com/ratfood.html
It lists safe foods, dangerous foods, age nutritional needs, sample weekly diet, and alternative suggestions.
For the bedding, I'm in Vlad's camp all the way. I love fleece and flannel. Fleece, flannel and Felt don't have woven fibers to get feet tangled, it absorbs urine, is washable, has zero dust to irritate respiratory tracts, and doesn't get kicked all over the floor to make a mess.
The only caution is that as they chew it, you need to be observant to change out hammocks as they get nibbled so that if they fall through a hole, they don't get strangled by getting stuck in the hole they made.
Even the chewed up linings are good, because I then cut them into bits and fill up a cardboard 'digging' box so they can root and hide in the pile.
I get mine from the remnant section of our Joeann's fabric store. It's always %50 off or more and comes by the yard.
As for Dalton, I could be wrong, but I do get the impression he/she's trying to genuinely be helpful and not pointing a finger at you specifically. It just wasn't as well worded as it could have been to avoid misunderstandings.
Ah the joy of text communication.
Welcome to the forum Bonnie/Clyde.
Post pics of your babies as soon as you are allowed!