I purchase two saws from Amazon. One was purchased as a backup for a demolition project but never needed it. The original saw held up very well cutting plaster walls and it is still functioning. You will get the original shipping packaging from Amazon and  unopened. It is not being sold on Amazon currently but this is the link to get more information. It has a 4.2 rating out of 5 on Amazon. 

Tekware Masonry Saw with Dust Extraction, 110V 5 in CircularSaw, Light Weight Circular Saw for Wood, Masonry, Tile, and Concrete $60 butpaid $80

About this item

DUST-FREE DESIGN: Tekware masonry saw built in a smart dustcollection system that reaches 98.76% dust absorbing effect, offers you ahealthy work environment

POWER & ACCURACY: Power 10.9 amp motor delivers the12,000 RPM cutting power to cut through wood, or granite, porcelain, concreteand other stone materials

HiGH CAPACITY: The power circular saws will cut up to1.57"(40mm) depth cutting capacity, 3.92"-4.93"(100mm-125mm) sawblade diameter

WIDE APPLICATION: This circular saw can be used for homedecoration and industrial wall/floor grooves. You can cut grooves in concrete,brick, marble

HEALTHY & LIGHTWEIGHT: The 7.87" (2m) dust suctiontube and dust bag protect you from dust infestation. The saw weighs only 10.8lbs for comfortable operating

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I would recommend getting these adapters to fit other blades.

https://www.amazon.com/gp/product/B0957GST15/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1

7 Pack of Adapter Bushings Used for Saw Blade Adjustment andConversion, Angle Grinder Cutting Machine Adapter

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ProductDescription

Tekware DustFree Circular Saw,110V Concrete Saw, Electric Circular Saw with Blade for Woodand Masonry

The Tekware5” masonry saw is a powerful cutting solution for tile, masonry, concrete, andwood. It combines a powerful 10.9 AMP motor that drives 12000RPM speed deliversthe power to cut through granite, brick, porcelain, reinforced concrete, wood,and other materials with ease.

Features

Dust Free DesignDetails

MultifunctionConcrete Saw

Powerful10.9 AMP Motor

Excellent 40mm Cutting Depth

Specifications

BladeDiameter: 100 mm-125mm

CuttingDepth: 1.57"(40mm)

Voltage:110V

Speed: 12000RPM

Power: 10.9AMP

Weight:10.78lbs(4.9kg)

What's inthe box

Circular sawx1pcs

CuttingBlade for Wood x1pcs

CuttingBlade for Masonry x1pcs

Dust suctionTubx1pcs

DustBagx1pcs