Sus forks with 1 1/8 are hard to come by. Suntour and RST make a bunch, but I think they are mostly things designed for commuting bikes (that often come with suspension in some european countries). Rockshox make a number of their lower end forks with 1 1/8th (Judy, Recon, etc.). But the best option I could find was a Manitou Markour. Rose currently have them for 200 euros:
[Edit: for some reason I read your post as looking for a 29er fork... what I said applies to that. Given the DISS is 26 you probably have more options. Wiggle have a few old Reba's on sale at the moment that may work]
Sus forks with 1 1/8 are hard to come by. Suntour and RST make a bunch, but I think they are mostly things designed for commuting bikes (that often come with suspension in some european countries). Rockshox make a number of their lower end forks with 1 1/8th (Judy, Recon, etc.). But the best option I could find was a Manitou Markour. Rose currently have them for 200 euros:
https://www.rosebikes.com/manitou-markhor-suspension-fork-100-mm-2676469
I think you can also upgrade the damper on a Markour to ABS+ suspension using this:
https://www.decathlon.co.uk/p/hydraulic-shock-damper-dial-r7/_/R-p-200641
[Edit: for some reason I read your post as looking for a 29er fork... what I said applies to that. Given the DISS is 26 you probably have more options. Wiggle have a few old Reba's on sale at the moment that may work]