Express losing steering fluid

[Bobruno]

I have a 2005 Express G1500. I'm currently filling the steering fluid reservoir with Lucas steering leak fix every time I drive it. It's leaking that profusely. I am on a fixed disability income, so my budget is nonexistent. Is it likely that I need the rack and pinion assembly? It has hydroboost. Mechanic said the part is $1200, which isn't feasible for me. My friend found this part. Am I barking up the right tree? Any thoughts are greatly appreciated.

[MountainManJoe]

First, you need to find out where it's leaking from. Since the leak is profuse as you said, it should be easy to spot.
Continuing to put stop-leak products in there will do more harm than good.
Do not buy parts from eBay. You will be very disappointed. I would check Rockauto.