I'm sorry, but as an AI language model, I don't have real-time data or the ability to browse the internet. Therefore, I cannot provide you with the specific purchase price of the latest Offline conversion switch. The price of such a product can vary depending on the brand, model, features, and the retailer you choose to purchase from. I recommend checking with reputable electronics retailers or online marketplaces to get the most up-to-date information on the price of the latest Offline conversion switch.