---
product_id: 55670864
title: "100 #9 INVOICE Envelopes by Sigma Source 3-7/8\" x 8-7/8\" Double Window Security Tint for QuickBooks, Computer Generated Invoices, Billing Statements and Legal Documents (Not For CHECKS)"
brand: "sigma source"
price: "NT$1382"
currency: TWD
in_stock: true
category: "Office Product"
url: https://www.desertcart.tw/products/55670864-100-9-invoice-envelopes-by-sigma-source-3-7-8
store_origin: TW
region: Taiwan
---

# 100 #9 INVOICE Envelopes by Sigma Source 3-7/8" x 8-7/8" Double Window Security Tint for QuickBooks, Computer Generated Invoices, Billing Statements and Legal Documents (Not For CHECKS)

**Brand:** sigma source
**Price:** NT$1382
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** 100 #9 INVOICE Envelopes by Sigma Source 3-7/8" x 8-7/8" Double Window Security Tint for QuickBooks, Computer Generated Invoices, Billing Statements and Legal Documents (Not For CHECKS) by sigma source
- **How much does it cost?** NT$1382 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/55670864-100-9-invoice-envelopes-by-sigma-source-3-7-8)

## Best For

- sigma source enthusiasts

## Why This Product

- Trusted sigma source brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Sigma Source Double Window Invoice Envelopes: Envelopes are packaged in 100 pieces per box and is designed for:    QuickBooks Invoices    Business Billing Statements     Legal Documents   Key Features and Characteristics: Size:  3-7/8" x 8-7/8" - just the right size for your QuickBooks Invoices   Easy Peel and Self-Seal - with good Adhesion and it easily shows if Envelope is tampered. Inside of Envelope is Blue Checkered Design - for Confidentiality, preventing content from showing or someone peeking! Color is White and is made with 24 LB Premium Smooth/Woven paper - envelope is strong (not flimsy or cheap) If you are LOOKING for High Quality Business, Invoice Envelopes that saves you time and stays intact during transport, Sigma Source Double Window Envelope is for you and most importantly,   No Licking Required - just PEEL and SEAL.  100% Refundable if you are not completely SATISFIED!

## Features

- &lt;ul&gt;&lt;li&gt; &lt;b&gt;DESIGNED FOR INVOICES AND BILLING STATEMENTS:&lt;/b&gt; Our #9 Invoice Envelope is designed for computer generated Invoices, QuickBooks Invoices, Billing Statements and Legal Documents. &lt;/ul&gt;&lt;/li&gt;
- &lt;ul&gt;&lt;li&gt; &lt;b&gt;EXCELLENT CONTENT PROTECTION:&lt;/b&gt; Security Tinted to make sure content stays confidential and protected.&lt;/ul&gt;&lt;/li&gt;
- &lt;ul&gt;&lt;li&gt; &lt;b&gt;PREMIUM QUALITY:&lt;/b&gt; Self Peel and Seal Flap with GREAT Adhesion; No Water or Licking Required! Just peel, press and you're done. Seal is excellent and long lasting.&lt;/ul&gt;&lt;/li&gt;
- &lt;ul&gt;&lt;li&gt; &lt;b&gt;SAVES TIME AND REDUCES COST: &lt;/b&gt; Double windows - no need to print or write on envelope. Self seal saves time and reduces cost - no liquid or licking required.&lt;/ul&gt;&lt;/li&gt;
- &lt;ul&gt;&lt;li&gt; &lt;b&gt;FEATURES: &lt;/b&gt; |&lt;b&gt;Color&lt;/b&gt;- White|&lt;b&gt;Texture&lt;/b&gt;- Smooth &amp; Woven|&lt;b&gt;Quantity&lt;/b&gt;- 100 per box|&lt;b&gt;Dimension&lt;/b&gt;- 3-7/8" x 8-7/8"| &lt;/ul&gt;&lt;/li&gt;

## Images

![100 #9 INVOICE Envelopes by Sigma Source 3-7/8" x 8-7/8" Double Window Security Tint for QuickBooks, Computer Generated Invoices, Billing Statements and Legal Documents (Not For CHECKS) - Image 1](https://images-na.ssl-images-amazon.com/images/I/41jYCe7HO-L.jpg)

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-02-02*