Stroller Price

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What do you think about this stroller price?
My sister got 2 used strollers from her friend for me, brought them to my house without previously talking about it and asked $100 for them. We said " if we can pay in installments" but didn't really look at them as I trusted my sister would ask a fair price.One is a 6 year old Bell jogging stroller with 5 point harness and canopy and a small basket for storage on the back. It is not collaspable and has been used for 3 children. The other is a 4 year old basic umbrella stroller used for 2 children.. Honestly I should have looked at them before agreeing to anything but I've checked it out on Kijiji and I can get comparable jogging strollers for about $50 and even brand new an umbrella stroller is only what, $20?I told her she was asking to much and now she's mad at me, I told her if I went to Toys R Us and bought something for $100 then went to Wal Mart and found it for $50 I'd return the first and by the second.What should I do?Nope I've only had them in my possesion for a week.