Good luck and feel free to contact me if you have any questions.
First who makes an offer on a home on a public website?
Second what would make you think an owner would accept a low offer just because that's all you can afford even if its cash?
Have you seen the home?
Obviously you are not working with an agent or you would know that all offers need to be in writing on a formal contract of sale.
I suggest you contact a local agent to help you find a home in the price range you can afford.