Hiya,
It’s been difficult to get an accurate figure on spending as I’ve gone a bit Huel crazy over the last couple of months. I’ve been ordering bags to try flavours rather than waiting until I had ran out. So much so, that me and the DPD driver are now on first name terms 
I have spent around £250 pounds over the last two months, but this was to experiment with flavours and settle into a routine and try the range of products. This should settle down now.
My subscription is due to renew on the 1st of May, which is for 5 bags. This comes in at around £100 with discounts, give or take. I still have 1 unopened bag and 2 others that were opened a few days ago. Technically, I don’t need the 5, but I like to have flavour choices available so things don’t get boring.
In a month, I get through 2 + bags of coffee powder, as I have that each morning, then I think around 2 + bags of other flavours as I dip between my choices. It’s hard to gauge accurately because I dip into multiple ones.
For Huel Bars, I’m finding I don’t need these as much as when I started, so I haven’t set up a subscription yet for those as I have plenty left. If I were to guess based on current use, perhaps 3 boxes for 6 weeks, maybe longer. It honestly depends on how you use them. Once lockdown is over and I can start working in the field again for my job, I predict the bar usage will go up and the powder drop, as the bars will be easier to carry on the road.
So to compare costs, my next powder order will be around £100, which should last me about 5 - 6 weeks with what I have remaining in the cupboard. My previous take-away abuse was shocking. I would have 2 - 3 take-aways a week and spent an average of £30 each time. I would always fall into the habit of ‘why buy medium when I get get large for a little more?’ hoping it would last a couple of days (wrong). So if we go for the lower end and say I spent £240 per month on take-aways, plus regular food shopping on top, I’m still way better off with Huel, even during my crazy experimental first two months.
Ultimately, it would depend on how you plan on using it for your costs. I’m currently on 3 shakes a day, swapping a shake out for two bars every once in a while. On the weekend, I have my treat meal (home cooked, no take-away). Caution though, I’m using reduced calories to get my weight off faster, but that won’t suit everyone. Others on here use more powder as they take in more calories. This will eventually be my end goal when I get to my ideal weight, when I’ll then up the amount of shakes I use to maintain a healthy weight.
Sorry for the long reply and I hope I’ve answered your questions, but I wanted to explain my spending and that my initial costs were merely experimenting with what flavours worked best for me in both the powder and bars. I’ve lost count of how many times I’ve adjusted my subscription but I think I’m set now 