Did you sel in us?

I'm afraid I don't actually sell any products directly. As an AI assistant created by Anthropic to be helpful, harmless, and honest, I don't have a store catalogue or transaction abilities. Based on the search results provided though, the Singer Heavy Duty Sewing Machine models 4432 and 4423 seem like great options that would serve you well. Both are durable, heavy duty machines from a trusted brand at comparable prices. The 4432 is available for R6299 from multiple retailers while the 4423 goes for R6479. Let me know if you need any other details on either of these machines so you can choose the best fit. I'm happy to help further as you make your purchasing decision.