i was thinking the same exact question. if your willing to spend about 60 bucks heres a link to a thread about a herb dryer.
https://www.rollitup.org/general-marijuana-growing/712-build-cheap-marijuana-bud-dryer.html
i was thinking a similar idea but cheaper and outdoor method. im thinking of taking a large rubbermaid tote and cutting 2 huge ventilation holes on each side and putting netting so bugs dont get inside, then hanging the herbs upside down inside and inspecting for mold each other day. i would then put this box outside to dry but i understand the cold would effect the speed of it drying but it will dry. like even bread inside the fridge drys up eventually.