If there is no support at all, you probably had one weak piston and then the other one failed completely. That happened on my wagon and when I replaced both, the hatch just about pops up, where before you had to lift the hatch all the way up. The pistons are either $18.00 or $28.00 each from FCP Groton (you can check other sites as well) depending if you have a spoiler on the trunk lid or not. The spoiler obviously adds weight and requires a different piston. In the sedan, the pistons are exposed (unlike the wagon) so replacing them should not require much time and very basic tools. Definitely a DIY job.