Tis true, the geared Giant 125, 2005 model year was the last year they made them suspensionless. We have one them. I am quite pleased with it. It has an articulating stem that allows you to adjust the cockpit to fit, 7 speeds, SRAM shifting, decent saddle. I bought some high pressure 20" recumbent tires to help lower rolling resistance and let us get in longer rides. Not much off roading being done so this works out okay for now.

In my earlier comment about fork swapping, I meant that you could likely accomplish this by getting a hard tail geared bike and then find a rigid fork to fit that. This might be the easiest option in that there are plenty of both types of bikes like these out there. Just not very many non-suspended geared bikes. Those Isla's do look very nice though. I am toying with ordering their 24" for my oldest in the next year or two.