I found this as well. Seems like Rite Aid or Similar is the place to go. I will call some florists in the morning and let you know. I want to get some as well (not the tallow kind though . ewwwww!!!).
Preserving FoliageTop of Page
One of the best ways is with glycerine, known chemically as glycerol, a
by-product of the soap industry. It comes in both a synthetic and natural form. Natural glycerine comes from animal fat (tallow) and vegetable oil. Most of the tallow glycerine comes from Mexico, and most vegetable glycerine has no odor and is a “water white” clear liquid. Occasionally, tallow glycerine has a yellow or brown discoloration and often has an odor because it is almost impossible to remove particles of animal fat during the refining process. Remove dust from leaves, pound lower ends of stems with a hammer to split bark and loosen wood. Stand material in a jar containing a solution of 2/3 water and 1/2 glycerine, so it reaches 3 or 4 inches up the stems. Allow a week or so for the solution to be absorbed. Leaves and low-growing plants may be laid in the solution so they are covered. Glycerine will change the foliage to a darker color, and it will last indefinitely.