... I just got a 'reciept' of a $28.99 payment made to someone.

It looked very conviencing. It had a link to dispute the transaction...(I suppose that was the hook to get you to log in using their site). I went to Paypal and no such transaction was listed.
BELOW is the Email

Dear PayPal Member,

This email confirms that you have paid Debbie's RC World, Inc., (eric@debbiesrcworld.com) $28.99 USD using PayPal.

This credit card transaction will appear on your bill as "PAYPAL DICK's Sporting*".

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PayPal Shopping Cart Contents

Item Name: The InStep. "My Caddy" push cart
Quantity: 1
Total: $28.99 USD
Cart Subtotal: $28.99 USD
Shipping Charge: $0.00 USD
Cart Total: $28.99 USD

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Shipping Information

Shipping Info: William Rusaw
11 Raritan Avenue
Highland Park, NJ 08904
United States

Address Status: Unconfirmed

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If you have not authorized this charge, click the link below to cancel the payment and get a full refund.

Dispute Transaction

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Thank you for using PayPal!
The PayPal Team