Hi Alexandria,
Wholesaleflash has been around for a few years but they do not have a physical location or showroom. They do not have a business number you can contact them on and they only have a free email account (not a domain based).
Payment methods are not specified except that they accept credit card payments which is a safe payment option. It is entirely up to you whether you wish to work with this supplier, but if you please exercise caution and use your credit card. This way you can get your money back in the event that something goes wrong with the transaction.
Here are other suppliers that from our directory that you might be interested in working with:
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To find specific products on their sites, I recommend using the search function and also make sure you contact them directly (can do this via SaleHoo) in order to get their true wholesale pricing which is always better than you will see on their site. When doing this, provide them with the quantity you are ideally looking for, where you want them shipped to, and how often you plan on purchasing - this helps gets the best possible price.
Hope this helps you out and if you need anything further just sing out :)