What we deliver with this Offer 2) You can take advantage of add on services with this offer 3) Work will be submitted to you within 2 days of time. 4) This is one time services of 50 sales invoices for 30 dollar.Every time you need to purchase it whenever you require. 5) Deal will be done according to the guidelines of Guru.so your data will be safe. 6) More changes can be done according to your requirement. 7)Your Every buyers invoices will be separately given. 8) contact us before purchasing if you have any doubt. A sales invoice, or sales bill, is an essential and common document used by all kinds of companies.