Double edge razor is the answer. Initial outlay £20 for decent razor. My consumibles purchases in 2018 - two tubs of shaving soap @£1.99 each. Two packs of razor blades, one @£3.50 for five, two @£5.95 for 25. Total cost £19.38 and I probably have enough soap to last till April 2019 and blades till February 2019. It's a no brainer. All the consumables delivered in 48 hours to my door!!!!
We recently bought Neil Young's "Harvest" as a wedding present. I was gobsmacked to discover it cost £35!!!!!!!!!!!
I use a DE razor myself occasionally. Although i also use Bic 2 blade disposables that are only 10p each. But i always use proper shave soap with a brush, either Arko, Derby, or Palmolive, which can be bought dirt cheap online.
I wont buy any of the rip off priced wet shaving stuff.