In my experience getting reasonably priced shoes is at least 50% getting the right discounts. In the US, Saucony seems to do ridiculous discounts all the time. For EU I've had issues finding cheaper Sauconies, but MisterRunning usually has a lot of reasonable discounts. I haven't ran in the Ride 15s (although I tried them on), so I can't comment on shoes which may be similar in feel.
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Very true, I picked up the 15s for 60 GBP. The Ride 16s are around 115 GBP, which seems quite a jump. Especially considering my average running pace!
I may just end up picking up another pair of 15s as they still seem to be about for that price.
Similar in filling the same role as a versatile daily trainer or something that fills a different role (shoe for speed work or with more cushioning), but that might suit you based on you enjoying the ride 15?
For the former you could look at the puma velocity nitro 2. One note that at least in EU sizes puma and Saucony slightly differ, so look at the actual cm in the sizing chart (my usual eu46 for example would run 0.5cm or so longer)
I have had plenty of luck finding deals on Runrepeat.com
I just got a pair of Hoka Arahi 6 in addition to these and they're great. I'm over-pronating a bit though, so your mileage may vary