Help! - Moisturizing Natural hair in Cold Winter S

The meat/ Question:

If you live in a state that gets very cold during the winter, (I mean single digits or subzero) what are you doing to keep your natural hair moisturized and healthy?  If it adds shine, too, all the better. Feel free to say where you live.

Also, where do you normally buy this product and for how much? I’m a penny pinching to save for a house, so I have no interest or ability to fall in love with an expensive product.

The potatoes/ Details and backstory:

• I am doing the long transition and am about 19 months along.
• In some sections of my hair I still have up to 3 inches of relaxed hair left, other sections have no relaxed hair at all, but there doesn’t seem to be any difference as far as which sections are the driest.
• So far I’m mostly “bunning” as a style but the hair is still extremely dry. Seems like product just sits on top of my hair but never really penetrates.
• My hair is about APL and very thick so co-washing more (or otherwise adding more water) is not an option. It already takes a day and a half to be dry enough for me to safely go out in the cold even with a hat on. (I have to wash and set on Friday evenings to be ready for Monday mornings)
• I have my hair professionally pressed for a length check and maintenance snipping every 2-3 months and do not use heat on my hair at any other time.
• Overall the hair seems soft and healthy, just not as moisturized as I would like.

Vegetables/Things I’ve tried already:

• All of the following oils, individually and in various combinations: coconut, extra virgin olive, jojoba, avocado, grapeseed, sweet almond, apricot kernel, rosemary essential, lavender essential, and mineral. (And before anyone loses it, my sister grew her natural hair down to her butt sealing after every co-wash with mineral oil but I think it’s because she lives in a very warm place (Florida))
• Shea butter. Tried this raw and mixed in with various store bought and homemade products with disastrous results that nearly damaged my hair.
• Hot 6 Oil, Africa’s Best, ORS Olive Oil, and Profectiv
• Currently using Dark ‘n Lovely Softening Oil (which is barely okay, but definitely not okay enough to tolerate that loud bubble gum smell)
• I tie my hair up in the evenings with a silk scarf and add a satin bonnet before bed
• During the warm months I can use Bioinfusions Olive oil line (available at Walgreen’s for under $8 an item) and the results are stellar but it doesn’t seem as effective during these lower temperatures.
• Last winter I was able to use Skala Avocado Leave in Styling Cream, but I believe this product has been discontinued because I can’t find it anywhere. The last place I saw it was Big Lots marked down to $1 which is almost a sure sign this stuff is no longer in production. My supply of that has been exhausted.

 I’ve searched this site and many others and it seems like what I’ve found so far doesn’t take into consideration that I’m dealing with extreme temperature conditions. I didn’t come this far just to have my hair freeze and break off, or die of thirst. Please, please help. I don't know what else to try.

Thank you in advance