UK beginner looking for cheapest bibshorts for 2 hour rides

The reason I'm looking for cheaper bibshorts is that these ones won't be my size in 3 months from now. However, I do want to have a reasonably comfy butt in 2 hour-ish rides so am happy to spend what i need to spend. What do people recommend?
2010 Specialized Rockhopper
2012 Bianchi Infinito

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