As stated, Avery Labels are readily available, but there are also other generic labels of the same sizes as Avery.
The great kicker is Avery Downloadable Templates! Once you have the label size you want, go to the Avery site and get the free templates. It's a little fussy if you want to add a lot of graphics from different sources, but with Word, it's a piece of cake. Simple text labels. Fonts are your Friend~~~
If you don't have a laser printer at home, create your label, put it on a flashdrive, take it to your local print shop. You can buy the labels there and have them print the labels for you.
I have a really small print shop in town, so I buy a packet of labels there, and print a few pages at a time. I can bring back the same packet later and print a few more pages as needed. They don't get fussy with me bringing my own labels as they know I bought them there in the first place.
Also, I only have B/W printer, so the print shop does all the short run color stuff I need.
Larger box stores may not be so accomodating with you bringing your own labels until you generate a good relationship with them.
Have Fun!
PS- Don't worry about all the regs for labeling for hobby sauces. The one thing I would strongly encourage you to put on your labels is the ingredients, in descending order. THere's so many weird allergies out there, it would be really sad if a friend-of-a-friend got sick from something in the sauce.
SL