You could looking into buying Korn (liquor) because the Absinthe contains more than just alcohol as active ingredient. Thujone is also contained in it which wont go good with salvia.

You could also look into buying or making a small distillery and then simply buying cheap vodka to distill.

You could also go ahead and buy acetone. Then do the whole extraction and then dump the extract into vodka which will be cheaper overall and also food save if the acetone doesnt contain any bittermakers in solid form.